Spring的StringUtils⼯具类
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原⽂⽹址：
org.springframework.util.StringUtils
我们经常会对字符串进⾏操作，spring已经实现了常⽤的处理功能。我们可以使⽤org.springframework.util.StringUtils ⼯具类帮我们处理字符串。⼯具类整理如下：
1 StringUtils.hasLength(null) = false;
2 StringUtils.hasLength("") = false;
3 StringUtils.hasLength(" ") = true;
4 StringUtils.hasLength("Hello") = true;
5
6 StringUtils.hasText(null) = false;
7 StringUtils.hasText("") = false;
8 StringUtils.hasText(" ") = false;
9 StringUtils.hasText("12345") = true;
10 StringUtils.hasText(" 12345 ") = true;
11
12//是否包含空⽩字符
13 ainsWhitespace(null)=false;
14 ainsWhitespace("")=false;
15 ainsWhitespace("a")=false;
16 ainsWhitespace("abc")=false;
17 ainsWhitespace("abc")=false;
18 ainsWhitespace(" ")=true;
19 ainsWhitespace(" a")=true;
20 ainsWhitespace("abc ")=true;
21 ainsWhitespace("a b")=true
22 ainsWhitespace("a b")
23
24 imWhitespace(null)=null;
25 imWhitespace("")="";
26 imWhitespace(" ")="";
27 imWhitespace("/t")="";
28 imWhitespace(" a")="a";
29 imWhitespace("a ")="a";
30 imWhitespace(" a ")="a";
31 imWhitespace(" a b ")="a b";
32
33 imLeadingWhitespace(null)=null;
34 imLeadingWhitespace("")="";
35 imLeadingWhitespace(" ")="";
36 imLeadingWhitespace("/t")="";
37 imLeadingWhitespace(" a")="a";
38 imLeadingWhitespace("a ")="a ";
39 imLeadingWhitespace(" a ")="a ";
40 imLeadingWhitespace(" a b ")="a b "
41 imLeadingWhitespace(" a b c ")="a b c "
42
43 imTrailingWhitespace(null)=null;
44 imTrailingWhitespace(" ")="";
45 imTrailingWhitespace("/t")="";
46 imTrailingWhitespace("a ")="a";
47 imTrailingWhitespace(" a")=" a";
48 imTrailingWhitespace(" a ")=" a";
49 imTrailingWhitespace(" a b ")=" a b";
50 imTrailingWhitespace(" a b c ")=" a b c";
51
52
53 imAllWhitespace("")="";
54 imAllWhitespace(" ")="";
55 imAllWhitespace("/t")="";
56 imAllWhitespace(" a")="a";
57 imAllWhitespace("a ")="a";
58 imAllWhitespace(" a ")="a";
59 imAllWhitespace(" a b ")="ab";
60 imAllWhitespace(" a b c "="abc";
61// 统计⼀个⼦字符串在字符串出现的次数
62 untOccurrencesOf(null, null) == 0;
63 untOccurrencesOf("s", null) == 0;
64 untOccurrencesOf(null, "s") == 0;
65 untOccurrencesOf("erowoiueoiur", "WERWER") == 0;
66 untOccurrencesOf("erowoiueoiur", "x")=0;
67 untOccurrencesOf("erowoiueoiur", " ") == 0;
68 untOccurrencesOf("erowoiueoiur", "") == 0;
69 untOccurrencesOf("erowoiueoiur", "e") == 2;
70 untOccurrencesOf("erowoiueoiur", "oi") == 2;
71 untOccurrencesOf("erowoiueoiur", "oiu") == 2;
72 untOccurrencesOf("erowoiueoiur", "oiur") == 1;
73 untOccurrencesOf("erowoiueoiur", "r") == 2;
74
75//字符串替换
76 String inString = "a6AazAaa77abaa";
77 String oldPattern = "aa";
78 String newPattern = "foo";
79// Simple replace
80 String s = place(inString, oldPattern, newPattern);
81 s.equals("a6AazAfoo77abfoo")=true;
82
83// Non match: no change
84 s = place(inString, "qwoeiruqopwieurpoqwieur", newPattern);
85 s.equals(inString)=true
86 s = place(inString, oldPattern, null);
87 s.equals(inString)=true
88
89// Null old pattern: should ignore
90 s = place(inString, null, newPattern);
91 s.equals(inString)=true
92
93//删除字符串
94 String inString = "The quick brown fox jumped over the lazy dog";
95 String noThe = StringUtils.delete(inString, "the");
96 noThe.equals("The quick brown fox jumped over lazy dog")=true;
97 String nohe = StringUtils.delete(inString, "he");
98 nohe.equals("T quick brown fox jumped over t lazy dog")=true;
99 String nosp = StringUtils.delete(inString, " ");
100 nosp.equals("Thequickbrownfoxjumpedoverthelazydog")=true;
101 String killEnd = StringUtils.delete(inString, "dog");
102 killEnd.equals("The quick brown fox jumped over the lazy ")=true;
103 String mismatch = StringUtils.delete(inString, "dxxcxcxog");
104 mismatch.equals(inString)=true;
105
106//删除任何字符
107//源代码如下
108//char c = inString.charAt(i);
109//如果不存在 c 值，则返回 -1
wispring是什么意思110//if (charsToDelete.indexOf(c) == -1) {
111//out.append(c);
112//}
113
114 String inString = "Able was I ere I saw Elba";
115
116 String res = StringUtils.deleteAny(inString, "I");
117 res.equals("Able was ere saw Elba")=true;
118 res = StringUtils.deleteAny(inString, "AeEba!");
119 res.equals("l ws I r I sw l")=true;
120 String mismatch = StringUtils.deleteAny(inString, "#@$#$^");
121 mismatch.equals(inString)=true;
122
123//源代码如下 return (str != null ? "'" + str + "'" : null);
124 assertEquals("'myString'", StringUtils.quote("myString"));
125 assertEquals("''", StringUtils.quote(""));
126 assertNull(StringUtils.quote(null));
127//将第⼀个字符改⼤写
128 StringUtils.capitalize(Str)
129//将第⼀个个字符改⼩写
130 StringUtils.uncapitalize(str)
131
132//" -> "
133//获取字符串⽂件名和扩展名
134 Filename("myfile").equals("myfile")=true;
135 Filename("mypath/myfile".equals("myfile")=true;
136 Filename("mypath/myfile".equals("myfile")=true;
137 Filename("").equals("")=true;
138 Filename("").equals("")=true;
139
140// 获取字符串扩展名，以.分隔
141 FilenameExtension("myfile")=null;
142 FilenameExtension("myPath/myfile")=null;
143 FilenameExtension("myfile.").equals("")=true;
144 FilenameExtension("myPath/myfile.").equals("")=true;
145 FilenameExtension("").equals("txt")=true;
146 FilenameExtension("").equals("txt")=true;
147
148//舍去⽂件名扩展名
149 StringUtils.stripFilenameExtension(null)=true;
150 StringUtils.stripFilenameExtension("").equals("")=true;
151 StringUtils.stripFilenameExtension("myfile").equals("myfile")=true;
152 StringUtils.stripFilenameExtension("mypath/myfile").equals("mypath/myfile")=true; 153 StringUtils.stripFilenameExtension("myfile.").equals("myfile")=true;
154 StringUtils.stripFilenameExtension("mypath/myfile.").equals("mypath/myfile")=true; 155 StringUtils.stripFilenameExtension("mypath/myfile.").equals("mypath/myfile")=true; 156 StringUtils.stripFilenameExtension("").equals("myfile")=true;
157 StringUtils.stripFilenameExtension("").equals("mypath/myfile")=true
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